pytorch

53a368fe - [aten] Split some at::launch code into at::internal::launch_no_thread_state() (#38477)

[aten] Split some at::launch code into at::internal::launch_no_thread_state() (#38477) Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/38477 A few specific uses (e.g. Thrift rpc parsing) don't need source thread state to be copied over. In microbenchmarks, this seems to add ~500ns, so split code across functions, so some code can use directly. ghstack-source-id: 104190095 Test Plan: - Existing code using at::launch exercises this codepath, so buck test mode/dev-nosan caffe2/test/... - For the split version, primarily the Thrift-based change layered on top of this. Differential Revision: D21573168 fbshipit-source-id: 2ef1f196b5177634d4ee7fdca7371d36906a69d6